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Dynamically Tracing
     KDE
     Manish Chakravarty
     ThoughtWorks Studios




                            1
Agenda

• Learn about DTrace
• Learn what and where to Trace
• Trace!


                                  2
I. What is DTrace?


 While I go through the slides, please start copying the VM!

                                                               3
DTrace is..

• a comprehensive Dynamic Tracing
  framework created by Sun Microsystems
  for troubleshooting kernel and application
  problems in real time.




                                               4
Excuse me?



             5
• Dtrace enables us to “look into” the
  internals of a running production application
  and allows us to instrument it

• It can do very neat stuff in the kernel as
  well, but that’s not the point of this session




                                                   6
So how does DTrace
      work?


                     7
• Dtrace allows you to dynamically modify
  the operating system kernel and user
  processes to record additional data that
  you specify at locations of interest, called
  probes




                                                 8
• Dtrace probes come from a set of kernel
  modules called providers, each of which
  performs a particular type of
  instrumentation to create probes




                                            9
Provider:Module:Function:Name




                                10
Provider
The name of the DTrace provider that is publishing this
                      probe




                                                          11
Module
   If this probe corresponds to a specific program
location, the name of the module which the probe is
                        located
The name is either the name of a kernel module or a
                      user library




                                                      12
Function
    If this probe corresponds to a specific program
location, the name of the program function in which the
                    probe is located




                                                          13
Name
The final component of the probe name is a name that
 gives you some idea of the probe’s semantic meaning
              such as BEGIN or END




                                                       14
Thus:
Provider:Module:Function:Name



                                15
DTrace Architecture
                      16
Let’s start Tracing!



                       17
manish@belenix-KDE4:~/WorkOut/
DTraceTutorial$ pfexec dtrace -n BEGIN

dtrace: description 'BEGIN' matched 1 probe

CPU       ID            FUNCTION:NAME

 0    1                    :BEGIN

^C


                                              18
manish@belenix-KDE4:~/WorkOut/
DTraceTutorial$ pfexec dtrace -n BEGIN -n END

dtrace: description 'BEGIN' matched 1 probe

dtrace: description 'END' matched 1 probe

CPU       ID            FUNCTION:NAME

 0    1                   :BEGIN

^C

 0    2                    :END
                                                19
• The probe BEGIN fires every time you
  start a new tracing request

• The probe END fires every time you exit
  DTrace. In this case hitting Ctrl-C triggered
  it.




                                                  20
Hello, World!



                21
BEGIN

{

    trace("hello, world");

         exit(0);

}




                             22
Output..
manish@belenix-KDE4:~/WorkOut/DTraceTutorial/1-
HelloWorld$ pfexec dtrace -s hello.d



dtrace: script 'hello.d' matched 1 probe

CPU       ID             FUNCTION:NAME

 0    1                    :BEGIN hello, world




                                                  23
61,809
DTrace probes on the system!




   pfexec dtrace -l | wc -l


                               24
DTrace Architecture
  Source: http://wikis.sun.com/download/attachments/10390716/architecture.gif
                                                                                25
II. What / Where / How



                         26
• Navigate to the directory having the Qt
  source code

• Find out a good place in QObject to put
  one

• Start writing probes!


                                            27
Hack!



        28

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D trace kde4presentation